我想問既然hydrogen 係輕過helium,
但點解係helium 用黎做air ship,
而唔係用hydrogen 呢?
最好用english 答,
要簡易,唔好比成段野我... -V-
唔該晒! xD
收錄日期: 2021-04-13 14:34:07
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071123000051KK01567